Resistance-coil and support therefor.



No. 710,143. Patented septj'so, |902.

H. P. DAVIS. RESISTANCE con Ann suPPonT 'rm-:nimm

(Application filed Dec. 26, 1901.)

(No Model.)

/NVENTOH Wy A WORN/5).

UNiTED STATES PATENT @n :fici-.5.

HARRY PHILLIPS DAVIS, OF PITTSBURG, PEN ISYLVANIA, A:-.\`G.\"OR 'lO WESTINGIIOUSE ELECTRIC d: MANUFACTURING CO., A CORPORATION OF PENNSYLVANIA.

RESISTANCE-COL AND SUPPORT THEREFOR.

SPECIFICATION forming part of Letters Patent No. 710,143, dated September 30, 1902.

Application filed December 26, 1901. Serial No. 87,305. (No model.)

VIS, a citizen of the United States, residing in Pittsburg, in the countyof Alleghenyand State of Pennsylvania, have invented a new and useful Improvement in Resistance-Coils and Supports Theret'or, (Case No. l,026,) of which the following is a specification.

My invention relates to resist-ance apparatus for use in connection with electrical circuits; and it has for its object to provide a simple and inexpensive element comprising a resistance-coil and a supportingframe therefor and also a series of such elements which may be readily and inexpensively combined, so as to constitute a compact, thoroughlyventilated,and d urable resistance-coiumn.

My invention is an improvement upon the subject-matteroi' Patent No. 5l3,457,granted to the Westinghouse Electric d; Manai'act nring Company on the 23d day vf January, 1894, on an application filed by me.-

Myinvention is especially useful in conne@ tion with the operation and control of railwaymotors, but is obviously susceptible of use in any other relations where it is desired to introduce a greateroraless amount cf resistance into an electric circuit.

Referring now to the drawings, Figure l is a longitudinal sectional view of a resistancecolumn constructed in accordance with my invention. Figs. 2 and 3 are elevations of the respective end frames of the column shown in Fig. l, and Fig. It is an elevation of one of the intermediate frames. v

The resistance unit or element l is in the present case a spiral coil of `strap metal of suitable. composition and dimensions Vlortlie' purpose desired, the several turns being insulated from each other by intercoiled insu- -lating material 1-such, for example, a.:

scraps of inica,. ,This insulating material preferably projects laterally beyond the edges of the metal strip, as indicated in the drawings.

The frame 2 for supporting the coil comprises two concentric rings 3 and 4 in the same plane and connected by a plurality of arms or spokes 5 and a third ring 6 of greater diameter and located in an adjacent plane,

the 1- Be it known that I,v HARRY PHILLIPS DA- l 6 being joined to the ring by means of a pluralityv of pairs of apprt'iximately parallel arms 7. 'ihe dillerent-c between the external diameter of i ie rin;r :1.- and the interna-l diameter of the ring i5 is snbstantiaily equal to the thickness of the coil, so that after cach coil is wound upon the outside of the ring i it will iit inside oi' the ring (i et' the adjacent supporting-lratne L. Each ringl G may be ,nrovided at one side with a perforated lug to receive a conductor and with binding-screws 'il to clamp the cmidnctor thereto.

ln order to space a sa .the adjacent frames 2 and properly insulate them l'rom eachother, I interpose between them a plurality 0i` blocks l0, ot" insulating material. I have i'ound that pri-:sacd asbestos is a. desirable material ot' which to make these blocks; botany other material tha t may be found suitable may obviously be employed. in order to prevent. dislodgmentol' the blocks l0, I may provide the arms 7, between which 'ihn biocitsare located, with inwardly-projecti:ig ings ll and form the blocks with correspontling grooves or recesses, into which the ings fit. The inner end ot' cach resistance-coil may be fastened to the ring i, on which it is wound, by anysuita-ble means, and its outer end may be also fastened to the ring 6 of 'the adjacent frame by any desired means. For the latter connection I have shown in Fig. i a plate l2 and clamping-screws 1S, an opening lat being provided inl the ring 6 adjacent uo the clamping device, through which the end of the strip may project.

Any desired number of frames and coils may be combined to form a column, and for the purpose of suitably clamping and supporting the several elements I mount them upon a rod l5, from which theyare insulated by means of a tube 1G, of suitable non-conducting material. The end frames 17 and 1S are made of slightly-different form from the inner frames and are provided with strengthening-ribs 19, as indicated in Figs. 2 and 3. The several elements of the column may be clamped together upon the rod l5, so as to constitute a durable compact structure, by means of binding screws ornuts or any other suitable clamping devices. (Not shown.)

IOO

\Vhen thus combined, it will be noted that the individual members of the column are spaced apart, so as to provide thorough ventilation, that the individual coils are well insulated from each other, and that the whole structure is inexpensive and compact in construction and arrangement.

My invention may obviously be modified as regards minor details of consti-notion withoutdepart-ing from the invention, and I therefore desireit to be understood that the invention is not limited, except in so far as limitations are specied in the claims.

I claim as my inventionl. A resistance element comprising two rings of different diameters projecting in opposite directions from an open-work frame, a spiral coil of resistance material surrounding the smaller ring and a plurality of insulatingblocks mounted in the frame at one side of the coil.

2. A resistance element comprising two rings of different diameter located in parallel planes and connected by a plurality of parallel arms and insulatingblocks severally located between said pairs of arms.

A frame fora resistance-coil comprising two rings of diierent diameter and located in parallel planes and connected by a plurality of pairs of substantially parallel arms.

4. A resistance-column consisting of a set of superimposed frames each of which cornprises two rings of different diameter located in different planes and connected by a plurality of pairs of arms, insulating-blocks between the several pairs of arms and resistance-coils concentrically disposed between the several rings of lesser diameter and the rings ot larger diameter that pertain to the adjacent frames.

5. A resistance-column consisting of a set ofsuperimposed annular frames each ofwhich comprises two concentric rings in the same plane and a third ring in a dierent plane, a plurality of pairs ot arms between the lastnamed ring and the outer ring in the other plane, insulating-blocks between the several pairs of arms and spiral resistance-coils interposed between the outer rings and the rings of lesser diameter pertaining to adjacent frames.

6. A resistance-element frame comprising two concentric rings in the same plane connected by radial arms, a third ring in a different plane and a plurality of pairs of arms between the third ring and the outer ring in the other plane.

7. A resistance element consistingI of a frame comprising two concentric rings and connecting-arms, a third ring in a ditt'erent plane anda plurality ot` pairs of arms between the same and the outer ring in the other plane and a spiral coil of interleaved, conducting and non-conducting stripswound upon one of said rings.

S. A resistance-column consisting of a rod and a set of resistance elements mounted thereon, each of which com prisesaframe having two rings of ditferent diameter located in parallel planes and connected by a plurality of pairs of arms, non-conducting blocks located between said arms and a spiral resistance-coil interposed between each ring of lesser diameter and the concentrically-disposed ring pertaining to the adjacent frame.

In testimony whereof Ihave hereunto subscribed my name this 16th day of December, 1901.

HARRY PHILLIPS DAVIS.

Vitnesses:

H. N. BARTLETT, Jos. W. ALEXANDER. 

